Qt:Документация 4.3.2/demos-undo-commands-h

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[править] commands.h Example File
demos/undo/commands.h

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 #ifndef COMMANDS_H
 #define COMMANDS_H
 
 #include <QUndoCommand>
 #include "document.h"
 
 class AddShapeCommand : public QUndoCommand
 {
 public:
     AddShapeCommand(Document *doc, const Shape &shape, QUndoCommand *parent = 0);
     void undo();
     void redo();
 
 private:
     Document *m_doc;
     Shape m_shape;
     QString m_shapeName;
 };
 
 class RemoveShapeCommand : public QUndoCommand
 {
 public:
     RemoveShapeCommand(Document *doc, const QString &shapeName, QUndoCommand *parent = 0);
     void undo();
     void redo();
 
 private:
     Document *m_doc;
     Shape m_shape;
     QString m_shapeName;
 };
 
 class SetShapeColorCommand : public QUndoCommand
 {
 public:
     SetShapeColorCommand(Document *doc, const QString &shapeName, const QColor &color,
                             QUndoCommand *parent = 0);
 
     void undo();
     void redo();
 
     bool mergeWith(const QUndoCommand *command);
     int id() const;
 
 private:
     Document *m_doc;
     QString m_shapeName;
     QColor m_oldColor;
     QColor m_newColor;
 };
 
 class SetShapeRectCommand : public QUndoCommand
 {
 public:
     SetShapeRectCommand(Document *doc, const QString &shapeName, const QRect &rect,
                             QUndoCommand *parent = 0);
 
     void undo();
     void redo();
 
     bool mergeWith(const QUndoCommand *command);
     int id() const;
 
 private:
     Document *m_doc;
     QString m_shapeName;
     QRect m_oldRect;
     QRect m_newRect;
 };
 
 #endif // COMMANDS_H

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Qt 4.3.2